Intuition Begins with a Choice
What Descartes taught me about intuition, intellect, and will
I used to think that intuition meant recognising something as true without having to reason my way to it. Sometimes it was as simple as meeting someone for the first time and immediately feeling that I could trust them. If an idea felt immediate and obvious, and did not seem to need an argument to support it, I called it intuitive. It seemed entirely passive: a sense of certainty that appeared without any deliberate effort. I either had the intuition or I didn’t.
Reading Descartes made me reconsider this. For him, intuition is not a vague hunch or a feeling of certainty. It is an immediate act of intellectual perception that requires a clear and attentive mind. This raised a new question for me: if intuition requires deliberate attention, what exactly is voluntary about it?
Descartes: Intuition Is Not a Hunch
In Rule III of his Rules for the Direction of the Mind (1628) , Descartes describes intuition as the clear and attentive conception of something by the mind . Unlike deduction, which moves through a sequence of reasoning, intuition is immediate: the mind directly perceives what it is considering.
The word “attentive” matters. Descartes is not describing something that simply happens to us. Intuition requires us to direct our attention towards something and examine it carefully. This creates an important distinction: we can choose to look, but we cannot choose what we see.
Imagine bird watching through binoculars. You can decide to lift the binoculars, point them towards a particular branch, and adjust the focus. All of that is within your control. Once the image comes into focus, however, you cannot choose whether there is a blue jay sitting on the branch. You did not create the bird, and you cannot decide to see a hawk instead.
I think this captures something important about Cartesian intuition. Looking is active, but seeing is not. We can decide what to examine and bring it into focus, but we cannot decide in advance what will become evident once we see it clearly.
Intellect: What Becomes Visible
This distinction becomes useful in ordinary life whenever something seems obvious before we have examined it carefully.
Consider the statement: “I estimate a 10% probability that AI will cause a catastrophe.” The number sounds precise, and it is easy to react to it immediately — 10% sounds alarmingly high, or reassuringly low. Before deciding what to make of the claim, however, I need to look more closely. What does “catastrophe” mean here? What does the 10% actually represent?
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The important point is not whether the estimate is right or wrong, it is that my first reaction to the statement is not necessarily an intuition in Descartes’s sense. I may feel that I understand it without having actually examined what I am supposed to accept as true.
This is where I find Descartes’s idea of the intellect useful. I can choose to look more closely. I can direct my attention towards the claim rather than simply accepting the impression it initially creates. When I do, however, I cannot decide beforehand what I will find. If the claim becomes clear once I have examined it, I have not made it true by choosing to look at it, I have simply brought something into focus.
Will: Where Choice Enters
This is where Descartes’s distinction between intellect and will becomes important. The intellect perceives; the will affirms or denies. I can choose what to examine, but I cannot choose what becomes evident when I examine it carefully.
I can also choose whether to judge when my perception remains unclear. If I do not understand what a claim means or what supports it, I can withhold judgement rather than allowing my first impression to decide for me.
This gives the will a more limited role than I initially imagined. It does not manufacture truth. It directs attention and decides whether to assent.
The distinction matters because we often confuse the feeling that something is obvious with having actually examined it. We may encounter a claim, form an immediate impression, and then treat that impression as if it were the result of careful perception. Descartes gives me a reason to slow down and ask whether I have actually looked at what seems obvious.
What We Actually Choose
I began by thinking of intuition as a passive feeling of certainty. Descartes gives me a different picture. Intuition involves the intellect directly perceiving something, but that perception requires attention. I can choose where to direct my attention, and I can choose whether to make a judgment when what I perceive remains unclear. What I cannot choose is what becomes evident once I have brought something into focus.
The binoculars provide a useful image for this. I can decide where to point them and whether to look, but I cannot decide what will be sitting on the branch when the image becomes clear.
This is the practical lesson I take from Descartes: when something feels obvious, the first question should not be whether I trust my intuition. It should be: what have I actually looked at?
Photo by Annie Spratt on Unsplash
Originally published at https://laurentcailliette.substack.com on September 21, 2026.
